Service calls require multiple return visits because refrigerant charge is not set using proper subcooling targets, leading to persistent system performance issues.

Current approach relies on rule-of-thumb pressure checks rather than systematic subcooling-based charging, causing repeated callbacks and customer dissatisfaction.

Severity

4High

Willingness to Pay

implied

Added

Jun 19, 2026

Workarounds Described

Boss adds refrigerant based on pressure and line sweating instead of subcooling
Helper manually adds ounces while watching pressure fluctuate without diagnostic tool

Implied Software Gaps

Guided charging procedure with real-time subcooling calculation
Pressure fluctuation diagnostic tool to identify system issues during charging

App Concept

SubCool Pro

A mobile app that guides technicians through refrigerant charging using real-time subcooling targets. Calculates target subcooling from equipment specs, recommends charge adjustments, and logs pressure data to diagnose fluctuations. Prevents guesswork and reduces callbacks.

Key Features

Enter equipment model to get manufacturer subcooling target
Real-time pressure and temperature monitoring via Bluetooth probes
Step-by-step charge adjustment recommendations
Auto-log of readings for service history and trend analysis

Target Users: HVAC field technicians and helpers at small to medium-sized service companies

Revenue Model: $19/month per user subscription with a 14-day free trial

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